LS 5039
LS 5039 is a binary system in the constellation of Scutum. It has an apparent magnitude of 11.27,[2] and it is about 8,200 light-years away.[3]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Scutum |
| Right ascension | 18h 26m 15.0568s[1] |
| Declination | −14° 50′ 54.242″[1] |
| Apparent magnitude (V) | 11.27[2] |
| Characteristics | |
| Spectral type | O(f)N6.5V + Black hole[3] |
| Astrometry | |
| Radial velocity (Rv) | 17.2 ± 0.7[3] km/s |
| Proper motion (μ) | RA: 6.826[1] mas/yr Dec.: −8.515[1] mas/yr |
| Distance | 8200±300[3] ly (2500±100[3] pc) |
| Orbit[3] | |
| Period (P) | 3.90603 ± 0.00017 d |
| Eccentricity (e) | 0.31 ± 0.04 |
| Inclination (i) | 24.9 ± 2.8° |
| Periastron epoch (T) | HJD 2451943.09 ± 0.10 |
| Argument of periastron (ω) (secondary) | 226 ± 8° |
| Semi-amplitude (K1) (primary) | 19.4 ± 0.9 km/s |
| Details[3] | |
| O star | |
| Mass | 22.9+3.4 −2.9 M☉ |
| Radius | 9.3+0.7 −0.6 R☉ |
| Luminosity | 182000 L☉ |
| Surface gravity (log g) | 3.85 cgs |
| Temperature | 39000 K |
| Rotational velocity (v sin i) | 113 km/s |
| Black hole | |
| Mass | 3.7+1.3 −1.0 M☉ |
| Radius | Probably 10.93 km |
| Other designations | |
| Database references | |
| SIMBAD | data |
LS 5039 consists of a massive O-type main-sequence star, and a compact object (likely a black hole)[3] that emits HE (high energy) and VHE (very high energy) gamma rays. It is one of the only three known star systems of this kind, together with LS I +61 303 and PSR B1259-63. The two objects orbit each other every 3.9 days, along a moderately eccentric orbit.[3]
References
- Gaia Collaboration (2016). "Gaia Data Release 1". Astronomy & Astrophysics. 595: A2. arXiv:1609.04172. Bibcode:2016A&A...595A...2G. doi:10.1051/0004-6361/201629512.
- Zacharias, N. (2012). "The fourth US Naval Observatory CCD Astrograph Catalog (UCAC4)". VizieR On-line Data Catalog. Bibcode:2012yCat.1322....0Z.
- Casares, J; Ribo, M; Ribas, I; Paredes, J. M; Marti, J; Herrero, A (2005). "A possible black hole in the -ray microquasar LS 5039". Monthly Notices of the Royal Astronomical Society. 364 (3): 899–908. arXiv:astro-ph/0507549. Bibcode:2005MNRAS.364..899C. doi:10.1111/j.1365-2966.2005.09617.x.
- "V* V479 Sct". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2 May 2018.
External links
- Discovery of Very High Energy Gamma Rays Associated with an X-ray Binary (Science Express) July 7, 2005
- Astronomers Discovery Very High Energy Gamma-ray Emission From Microquasar (ScienceDaily) May 19, 2006
See also
- LS I +61 303, the only other known VHE gamma ray producing system
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